Motor hand tool assembly



Get. 26, 1948. SCHUMANN 2,452,268

MOTOR HAND TOOL ASSEMBLY Filed June 29, 1945 2 Sheets-Sheet 1 g f Robert SchumdnEa Oct. '26, 1948. R. SCHUMANN MOTOR HAND TOQL ASSEMBLY Filed June 29, 1945 2 Sheets-Sheet 2 N w m g MN kw \...w J 9m Q N mm WW NM b T w m m @NBN 2 Robert Schumann g W Patented Oct. 2 6 1948 UNITED OFFICE I MD'JIQBLWD D LASSEMBLX Robert Sch mann, Racine, 'Wis.

Annlieaticn alar -2,8 1945, Se ia s -6 3 1. c aim f lhis i n io lates tea h d te I semhlv o the t pe op r t d ele tr ca ly neu t cally by t am ,o othe w sea d hiehl as arota ehlj or eguivalent movablepart.

It is aprime ect to p ov mea s .fq -mQhh ing and handling of the tool part having one or more passages therethrough for induction of uid usual y ai y a evice riv n by s ry or othermovable part.

A secon ob ec i t ovi v h d scha e of th a a te pas a e t rough the assembly, at h Wo ki ne of th t o p ope t p rm th a t onal unction o blowin away or removing detritus suchaschips, dirtanddust in order to greatly facilitate observation of the w at l i e en t expedite operetionl 'the tool generally.

Another im o n imi to ovid me n to augment the pressure and volume of the air or th fluid em ye t mpa t w ir ing ac i n thereto at the desired point or points of the m l ee the peelin ac ion and localize such action wherever desired inor along the assembly.

A further object is to provide such an assembly, operated Joya motorhaving a casing about the same, -to which a tubular-structure is detachably secured and which provides 'a passage or passages for the travel of air or other fluid ,in-,

duced-by a fan driven iromthe motor andlocated within-the tubular structure. 2

Still further, the invention provides a simple, inexpensive, sturdy and durable construction having the parts "suitably enclosed and. devoid of exterior projections such as would interfere with manual grasping and-handling of the- .assembly.

The more specific objects and advantages will in part be pointed outhereinafterand otherwise become apparent from a consideration of the description following taken in connection with the accompanying drawingsillustrating operative embodiments byway of example.

In said drawings:

Figure-1 is a view partlyin elevation and partly in central longitudinal-section through a hand tool assembly constructed in accordance withthe invention;

Figure 2 is across sectional-view taken on;the plane on: line 2-':2 of Figure'l;

Figure 3 is-across sectionalview-taken on'the' plane of line 3 -3 of :Figure- 1;

Figure 4 is a fragmentary longitudinal section taken "5 longitudinally of air-deflecting wanes used inthelairpassage ofthe-tool;

(o1. ire-so) Figu e hi a "v ew pa tl i e evat on and hali igu e 1s a ross c ona vi ta en-entire p n o in -o ,F i end i r Ti e fr m nta ede e atieh the m el m lo e in the 0 111 o i u Referring specif cally to the drawings wherein e reference c aract s desig a e like. 3 iler parts h o h h siifieren vi w the first'to the form' of the ;inve n tiqn illustrated in Figures 1 to 4, ill generally designates a tool adapted to be-"held manually in operation and which includes a rotatable shaft 1 I H mQtQT'LIf-Z in driving relation with said shaft, a casing or housing 1 3 in which the motor l2 is located, and a spindle head 1-4 in Which-the shaft ii, forthemost part, "is journaled. The shait H and associated parts are held against acoidental detachment from the spindle [head it, for "example, by a screw-threaded element 15. Shaft l l' isshown'as having a suitable tool element l6 detachably mounted thereon which is to Joe considered as representative or conventional as 'it --may be a grinding wheel, cutting tool; router,

drill-orotherwise.

The parts described are -to-be taken as conventional. Usually the motor 12 is an electric motor 'butit may represent any other type, for instance, a pneumatic motor, one operated by steam, or otherwise, and the shaft I I specifically is shown as rotatable so that itsmqtion willgbe imparted to th'etool l6.

:In-carrying out my invention-the spindlehead l4 is detachably screw-threaded at H to-themo-- tor housing and-it is providedwi-th-an interiorly extending shoulder-at 18 to abut a shoulder at 49 v on an outwardly extendin flange 2 l'iof a partitionplate 2| which servesas a mounting of loear ing for shaft :H or part rotatable therewith.

Flange =20 occupies a-cut-out portion-in the inner edge of the motorhousing lB soas to abut ashoulder 2 2 on the latter. in this manner, 1 it will be realized that the'toolproper with th e spindle ;M and partition 2! maybe detachably removedand appliedto-the housing. H r

Order d e th re eeae .Q ,9 P Q fluid'aroun-d'the motor l2 and associated parts andaround the spindle-head andltool I6, ,an impeller or fan element :23 is fastened on,a collar 24 rigid with the shaft ll so asto be rotatable.

therewith. Impeller 23 will induce air f ro m the tmo h i t i ih ih zt reii h heh h .4, un the motor :12 t u Q. s 25in the partitionpIateQ-I and then through openings v p 3 25 in the spindle head adjacent the rear end, which air then travels over the exterior of the spindle head [4 and discharges adjacent the tool "3. It will be understood that the impeller or vane 23 can assume various forms. As shown, it has a hub 24! surrounded by an integral outwardly extending flange or web 24 and blades or vanes 24 radially disposed and extendin rearwardly and longitudinally from the web 24 It is preferable to confine the air against the exterior of the spindle head through'one or more passages 21 preferably provided by employing a tubular shell or the like at 28 in surrounding but spaced relation to the spindle head M. This shell may be press-fitted or otherwise tightly secured at its rear edge 29 to the spindle head l4.

Shell 28 also includes a section, 29 and a section 30. Section 29 has an interior ring 3| effectively mounting an enlarged portion 32 of the enclosure for the shaft II. Between ring 3| and the outer wall of the section 29 a plurality of ribs or vanes 33 are formed, for instance, six as shown although any desired number may be used, which are preferably angularly arranged as suggested in Figure 4 and which also are of streamlined cross section. These vanes 33 deflect the air in its passage through the structure, giving it a whirling action, and directing it into the conical interior hollow space 34 of the shell section 30. This action is extremely effective especially due to the high pressure and volume of the air set in motion by the impeller or vane 23.

It will be noted that the air or cooling fluid is discharged at the zone of the tool It and as a result performs the second function of blowing detritus away from the tool in order to enable its operation to be observed at all times and accordingly expedite the operation of the assembly generally.

, Attention is called to the fact that although section 29 of the shell is shown as press-fitted at 35 to section 28, it may be made integral therewith and also that while section or nozzle 30 is shown separable from the section 29 by screw threads at 36, it may be made integral withthe section 29 and the latter integral with the section 28. In the aforesaid form of the invention, spindle head M is preferably outwardly enlarged or bulged at its rear end portion and the shell 28.

is approximately similarly shaped. This affordsa very effective hand grip for the manual holding and manipulation of the tool.

A modified form of the invention as shown in Figures 5 to 7 differs from the first form primarily in that the passage of the air or cooling fluid is.

and preferably through the bulge or enlargement at 44, adjacent the rear end,

Like in the first form of theinvention, head 42 is screw-threaded at 45 to a motor housing 46 and is shaped like the corresponding portions of spindle head it in order to secure a partition plate .41 identical with that at 21 in place. A shell 48 performs the function of that used at 28 but is less bulged-at its rear end portion than the shell 28'butis preferably press-fitted as at 49 onto the spindle head 42. Associated with shell 48 are sections 29 and 30, identical with those of spindle by one of said parts to induce air to travel in heat- .24, as contrasted with the addition of a lateral deflection of such air in the first form radially of the impeller 23'and through the openings 26 of the shell.

Various changes may be resorted to provided they fall within the spirit and scope of the invention.

What is claimed is:

1. A tool assembly including an operating shaft, a 'motor to' operate said shaft, means operable transferring relation to the assembly and discharge adjacent the tool-operating end of the assembly and means for imparting whirling action to the air at a point adjacent its discharge from the assembly.

2. A tool assembly including an operating shaft, a motor to operate said shaft, a housing for said motor, means carried by the housing for handling theassembly, means within the last mentioned means operable with the motor and shaft to inthree air through the assembly between the firstnamed means and shaft in heat-transferring relation thereto and mean for imparting whirling action to the air at a point adjacent from the assembly.

3. A tool assembly including a motor, a housing for said motor, a tool operating shaft driven by the motor, a spindle head about the shaft and extending from the housing, an impeller operable by said shaft to induce air around the motor, said spindle head being open at the end spaced from said motor for discharge of the air therethrough and means for. imparting whirling action to the air at a point adjacent its discharge from the assembly.

4. A tool assembly including a motor, a hous ing for said motor, a tool operating shaft driven by the motor, a spindle head about the shaft and extending from the housing, an impeller operable by said shaft to induce air around the motor,

said spindle head being open for discharge of the air therethrough, and means to confine the air the assembly.

5. A tool assembly including amotor, a hous ing for said motor, a tool operating shaft driven by the motor, a, spindle head about the shaft and extending from they housin an impeller operable by said shaft to induce air around the motor, said spindlehead being open for discharge of the air therethrough, means to confine the air passing through said openings around the spindle head and discharge the air adjacent the tooloperating end ofthe shaft and means for imparting whirling action to the air at a point adjacent its discharge from the assembly.

6. A tool assembly including a motor, a housextending from the housing, an impeller operable its discharge" by said shaft to induce air around the motor, said spindle head being open for discharge of the air therethrough, means to confine the air passing through said openings around the spindle head and discharge the air adjacent the tool-operating end of the shaft, and air-deflecting means in the passage for the air at the outlet end of the passage.

7; A tool assembly including a motor, a housing about the motor open to the atmosphere, an operating shaft driven by the motor, a spindle head disposed about the shaft and extending from said housing, a perforated partition plate secured in place between the housing and spindle head, said spindle head being open, and an impeller located in the spindle head and operated by said shaft.

8. A tool assembly having a motor, a housing about said motor open to the atmosphere, an operating shaft extending from the motor, a spindle head surrounding the operating shaft and detachably secured to said housing, shoulders on the housing and spindle head, a perforated partition plate clamped between said shoulders and through which the shaft passes, an impeller on said shaft within the spindle head, and said spindle head being open for passage of air therethrough.

9. A tool assembly having a motor, a housing about said motor open to the atmosphere, an operating shaft extending from the motor, a spindle head surrounding the operating shaft and detachably secured to said housing, shoulders on the housing and spindle head, a perforated partition plate clamped between said shoulders and through which the shaft passes, an impeller on said shaft within the spindle head, said spindle head being open for passage of air therethrough, and a shell surrounding the spindle head and carried by the latter.

10. A tool assembly having a motor, a housing about said motor open to the atmosphere, an operating shaft extending from the motor, a spindle head surrounding the operating shaft and detachably secured to said housing, shoulders on the housing and spindle head, a perforated partition plate clamped between said shoulders and through which the shaft passes, an impeller on said shaft within the spindle head, said spindle head being open for passage of air therethrough, a shell surrounding the spindle head and carried by the latter, a ring member within the shell adjacent the outer end thereof and through which the spindle head passes, deflecting vane means between the ring member and outer wall of the shell, and said shell being constricted and having its outlet adjacent the tool-operating end of the shaft.

11. A tool assembly having a motor, a housing about said motor open to the atmosphere, an operating shaft extending from the motor, a spindle head surrounding the operating shaft and detachably secured to said housing, shoulders on the housing and spindle head, a perforated partie tion plate clamped between said shoulders and through which the shaft passes, an impeller on said shaft within the spindle head, said spindle head being open for passage of air therethrough, said impeller having an outwardly extending wall, vanes extending radially from said wall, and the openings of the spindle head being disposed peripherally about said vanes.

12. A tool assembly having a motor, a housing about said motor open to the atmosphere, an operating shaft extending from the motor, a spindle head surrounding the operating shaft and detachably secured to said housing, shoulders on the housing and spindle head, a perforated partition plate clamped between said shoulders and through which the shaft passes, an impeller on said shaft within the spindle head, and said spindle head being open for passage of air therethrough, said impeller having peripherial vanes disposed angularly, and the openings of said spindle head being laterally opposite said vanes.

13. A tool assembly having a motor, a housing for the motor, an operating shaft extending from the motor, a shell for handling the assembly surrounding the shaft and means on the shaft for inducing a current of air through the housing and longitudinally of the shell with the air escaping from the shell at the end of the shaft spaced from the motor.

14. A tool assembly as in claim 13, wherein a spindle head surrounds the shaft inwardly of the shell to form a bearing for the shaft with the air flowing between the spindle head and shell.

15. A tool as in claim 13, wherein a spindle head surrounds the shaft inwardly of the shell to form a bearing for the shaft, said spindle head having radial openings therein adjacent the air current producing means whereby the flow of air is first radially against the shell and then longitudinally thereof.

16. A tool as in claim 13, wherein a spindle head surrounds the shaft inwardly of the shell to form a bearing for the shaft, said spindle head having openings therein laterally of the air current producing means with the axes of said openings extending longitudinally of the spindle head and shell whereby the flow of air is directly longitudinally of the shell.

ROBERT SCHUMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,990,017 Baumgratz et a1 Feb. 5, 1935 2,170,036 Schumann. r-w- Aug. 22, 1939 

